Inverse Case Converter

In short Inverse case flips the case of every letter: uppercase becomes lowercase and lowercase becomes uppercase, so "Hello World" becomes "hELLO wORLD". Its most common genuine use is fixing text typed with Caps Lock on while holding Shift, which produces exactly that pattern — the shift key inverted each letter, so inverting them all back restores the intended text in one step rather than retyping it. Beyond that it is a novelty transformation. Unlike lowercasing, inverting is its own inverse: applying it twice returns the original text exactly, because every letter simply swaps sides and nothing is discarded. That makes it safe in a way that most case conversions are not — converting to lowercase loses the record of which capitals were meant, while inverting preserves it in a scrambled form. Numbers, punctuation and characters without a case, including most non-Latin scripts, are passed through untouched.